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<nav id="nav" class="navbar navbar-default" >
    <div class="container-fluid">
        <div class="container">
<!-- 移动端导航 -->
                <div class="navbar-header">
                    <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false">
                        <span class="sr-only">切换导航</span>
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                    </button>
                    <a class="navbar-brand" href="#">HOPU学院</a>
                </div>
<!-- PC端导航 -->
                <div class="collapse navbar-collapse" id="navbar">
                    <ul class="nav navbar-nav navbar-right">
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</nav>